Pump jack



Oct. 15, 1935. g E, LAbER 2,017,169

PUMP JACK Filed April 7, 1934 6/ 7 44 Z I fire/wag ParA'SMDEz Patented Oct. 15, 1935 UNITED STATES,

PATENT OFFIC rum .uicx

Roy E. Slader, Fort Calhoun, Nebr. Application Apri 1, 1934, semi No. 119,414

1 Claim. (01. 14-45) This invention relates to improvements in pump Jacks and the main object is to provide which may be readily mounted on the p p and platform and driven by a relatively small ngine 'or motor and which will operate the pump iston rod with a vertical lifting motion saving wear on the pump as well as conserving power.

Another object is to provide a jack of this kind including a novel and efli cient clamping means 10 and base whereby it may be readily mounted and held on the pump housing, the vertical lifting action facilitating this convenient mounting arrangement.

Another object is toprovide a jack including 15 spaced base beams adapted to straddle the pump base and be pressed together thereon by a clamp bolt, the said beams carrying a power pulley driving a pair of gears through small pinions at each gear, the said gearsoperating a drive yoke piv- 20 oted on the frame and in turn pivoted to connecting rods running vertically upward and attached to the pump rod to operate the pump piston.

with these and other objects inview the in- '2 vention resides in the novel construction and arrangement of parts as hereinafter fully set forth and claimed, reference being had to the accompanying drawing wherein:

Figure 1 is a side elevation of the jack on a termed their rear ends by a cross beam 1. The. opposite frontal ends 8 are thus spaced freelyapart and form a cleftdesigned to receive the base A of the usual pumpB to which the beams may be tightly pressed by a clamp bolt 9 passed through the beams and provided with wing nut In. The 45 base is thus anchored to the pump and rests horizontally on the usual well platform C. The beams have sufillcient resiliency to permit the clamping action aforesaid.

Bearings II are provided and fixed in axial o alignment on the beams B at substantially a me: dial point thereof and a shaft I2 is journaled through the bearings and provided between the beams with a drive pulley I3 and outwardly of the bearings with drive pinions llall rigidly se- 56 cured totheshaft. Asimilarpair of bearings l5 jack 'A drive yoke I8 01 U-shaped form and prefer- 5 ably made up from a pipe as shown is provided by its blght I! in bearings 20 secured on the beam 6 outward and rearward from the drive pulley and gear assembly. The legs 2| of the yoke extend forwardly along the outside of the beams 6 clearing the drive gears I'I'towhich they are then attached 'by pivot or carrier bearings 22 having bores 23 freely and slidably receiving said legs 2| and ears 24 by which they are pivotally attached through bolts 25 to one spoke Ila of the gears as shown. The length of the yoke legs" 2| is such that they terminate substantially 'in vertical alignment and immediately-below the pump rod D of the pump B and at these ends the legs are forked at 26 to receive connecting rods 21 which are pivoted at 28 thereto, said rods 21 extending. vertically upward to substantially the level of the top of the pump where they are bent inwardly at 29 to meet the pump rod D and then flattened and turned upward providing ears. 30 pivotally 25 bolted at 3| to the pump rod. Like the yoke l8 these connecting rods 21 are preferably fabrisated from pipe.

In use any suitable engine or source of power (not shown) is beltedto the pulley I3 (or geared'30 to the gears l1) and these parts being set in ro- 'tation the legs 2| of the yoke |8 will be raised and lowered alternately causing the yoke to swing at its bight IS in the bearings 2|]. The amount of this lift and fall may bevaried by placing the pivot bearing bolts 25 in any of several different holes 32 formed in the drive gear spokes Ila it being understood that the pivot bearings 22 slide back and forth on the yoke legs 2| and swing by their ears 24 on the spokes as necessary. The 40 lift and fall of the yoke legs is of course trans: mitted through the connecting rods 21 to the pump rod D operating the pump in usual manner. Attention is directed to the vertical lift and operation of the connecting rod 21 brought about by the arrangement of their driving yoke I8. This arrangement operates the pump with greater ease, less wear and allows the operation efficiently with relatively small power. Also it greatly facilitates the work of mounting and connecting the jack on the platform and pump -since the strain is all directly downward against the platform and to hold the jack in place it is only necessary to anchor it lightly against horizontal play on the platform here very conveniently provided by the cleft base and the clamp' bolt 9. Practice has proven also that the light load and efllcient operation permits the use of wood bearings through out.

While I have herein set forth a certain preferred embodiment of myinvention it is understood that I may vary from the same in minor structural details so as best to provide a practical assembly for the purposes intended, not departing from the spirit of the invention and with in the scope of the appended claim.

.1 claim:

In a pump jack for mounting over an upright pump having a vertically reciprocable pump rod and a base portion at its ground line, a jack including a pair of spaced parallel sills adapted at one end to receive the pump base between them and being braced apart at the opposite end, means for locking the sill ends at the pump base to the base, a. U-shaped drive yoke pivoted at its bight to an intermediate portion of the base remote from the pump and extending at its free ends to a point alongside the pump rod, connecting rods pivote at their lower ends to the free ends of the 10 yoke and pivotally connected at their upper ends to the pump rod.

ROY E. SLADER. 

